Decks
Each deck is a stand-alone game set with its own difficulty level. The 3-symbol deck is the entry point — the 14-symbol deck is the master level.
Decks by number of symbols
|
Symbols per card |
Cards per deck |
Characteristic |
|---|---|---|
|
3 |
7 |
Ideal entry level for beginners. Fast, easy-to-follow gameplay. |
|
4 |
13 |
Slightly more complex, but still easy to follow. |
|
5 |
21 |
Intermediate level. Requires serious attention. Ideal for families. |
|
6 |
31 |
Advanced level. |
|
7 |
20 (47-symbol set) or 19 (43-symbol set) |
Strongly advanced. A special mathematical construction. |
|
8 |
57 |
Very difficult. Long, intense gameplay. |
|
9 |
73 |
Extreme difficulty. For experienced players. |
|
10 |
91 |
Maximum difficulty. |
|
14 |
183 |
Master level. Marathon gameplay, for teams. |
Practice decks
There is a special practice variant of the 3-symbol decks, designed for autistic children. The symbols are of identical size, are not rotated, and an orientation guide line is placed at the bottom of each card.
The practice deck is the best starting point for getting to know the system.

Suggested deck sets
3-symbol decks — 102 decks
4-symbol decks — 122 decks — BoardGameGeek.com

Single-colour decks
These contain the symbols in a single colour — eliminating the colour variable. They are especially useful for two groups: colour-blind children, and autistic children who have an intense colour preference.
The single-colour deck turns the favourite colour into a resource.
The ‘6’ and ‘9’ deck
Contains only 6s and 9s — one of the hardest decks in the system. The Poka-yoke marker (foot dot) is especially important here.
Multiple representations within one deck
Within a single deck, the same value can appear as regularly or irregularly placed dots, fingers, an Arabic numeral, a Roman numeral, tally marks, a partial number, a number assembled from two parts, a mirrored numeral, the value of a chess piece, the number of legs of an animal, the number of sides of a polygon, the proton number of a chemical element, in binary, as Morse code, in Braille, and even as the result of an addition or subtraction.
It is the value that must be identical — not the representation mode. This raises the challenge and strengthens the abstract understanding of number.
Which one is yours?
Browse the decks
Each deck has its own page with a detailed description and card samples.












